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Phase, as the term is used in audio, usually refers to loudspeaker? hookup. In a stereo system, the two loudspeakers should be working in tandem, their cones pushing and pulling at the same time, rather than working against each other. When this condition holds true, the two speakers are said to be acoustically in phase. Conversely, when one speaker pushes forward while the other pulls back, the speakers are out of phase, which usually causes loss of bass? and uneven sound. When speakers are out of phase, the situation can easily be corrected by reversing the connections to one of the speakers. (Fantel, Hans; The True Sound of Music - A Practical Guide to Sound Equipment for the Home; 1973, E. P. Dutton & Company, Inc., New York)

"Phase in sinusoidal functions? or in waves has two different, but closely related, meanings. One is the initial angle of a sinusoidal function? at its origin and is sometimes called phase offset or phase difference. Another usage is the fraction of the wave cycle which has elapsed relative to the origin." Wikipedia, Phase (external link)

Compression Wave

A measurement of the timing relationship between two signals, or between a specific vibration signal and a once-per-shaft-revolution event (Keyphasor). (Bentley Nevada Corporation; Field of Rotating Machinery Measurement, Monitoring and Analysis)

Relationship between waveforms at any moment in time. (Friend, David; Learning Music with Synthesizers; Hal Leonard Publishing Corporation, 1974)

See Also

9.26 - Orbital Phases
Berry phase
Figure 8.10 - Each Phase of a Wave as Discrete Steps
Figure 8.11 - Four Fundamental Phases of a Wave
Figure 8.2 - Compression Wave Phase Illustration
Figure 9.10 - Phases of a Wave as series of Expansions and Contractions
Figure 9.14 - Wave Flow and Phase as function of Particle Rotation
Figure 9.5 - Phases of a Wave as series of Expansions and Contractions
phase conjugation
Phase Velocity

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